Improvement in bolt-heading dies



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Maaaww j INIPROVEMENT IN BOLT-HEADING- DIES.

The Schedule referred to in these Letters Patent and making pax-t:` ofthe sarl-ne.

To all whom it 'may conce/mr Beit known that I, JOSEPH KAYLOR, ofPittsburg, in the county of Allegheny,and State of Pennsylvania, haveinvented a new and useful Improvement in the Manufacture of Bolts; and Ido hereby declare the following to be a full, clear, and exactdescription thereof,

-reference being had to the accompanying drawing, making a part of thisspecification, in which- -Figure 1 is a perspective view of abolt-machine fitted with my improved dies, and illustrative of theiroperation;

Figure 2 is a vertical cross-section through the griping-dies, just inthe rear of the bottom of the recess in which the bolt-head is formed;and x Figures 3 to 6 are perspective views of various forms of diesillustrative of my improvement.

Like letters of reference indicate like parts of each.

My invention relates to the construction of dies for bolt-headingmachines, and more particularly to that class of dies, which, by asecond or subsequent stroke, when the partly-formed bolt-head is turnedpart way around, work in the flash, or ire, made at the first or aprevious stroke; and

The nature of it consistsin making the heading-side of the dies with adouble recess, the inner recess being of the size and shape of thebolt-head to be made, 'and the outer recess being larger than the innerrecess on two sides, which two sidesmay be either adjacent or oppositeto eachother, the two remaining sides of the larger recess being ushwith the corresponding sides ofthe inner, or bolt-head recess. The Hash,or fire, is then formed on the edges of the bolt-head, next the opensides of the outer recess, so that the bolt-head being turned part wayaround for another stroke of the dies, the dash, or fire, will come nextthe sides of the outer` recess, which are flush with the sides of theinner, or bolt-head recess, hywhich, and-the heading,

such ash, or ire,'will be worked into the`head.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and mode of operation.

Ajs the frame of the machine;

" B; the cam-shaft; and' C and C', cams, which are so set that the one,O', shall operate a littlein advance of the other, C.

D is a stationary, and

D', a movable die-block, though both may be movable, if so preferred.

In these are set the griping or side-dies (l d.

b is a `heading-die, actuated by the cam C, through the stem b. y

f is a like stem, which, operated by the cam O', gives the die-block Dand its die d a forward stroke.

The diefdreceives its return-stroke from a spring, g, and-the headeribis carried back by a like spring o r other equivalent device, attachedat any suitable point.

A is an aperture in the frame, through which the bolt-,rod,fprope11yheated, is fed in.

The griping-dies d d have the usual cavities, i, for the shank of thebolt.

In the several igures, e represents the inner, or bolt-j. head recess,half .of it being made in each die, and in such a way that when the twodies come together, the inner recess so formed will give the propercavity for a square 'bolt-head, as in flgs. 1, 2, and 5, or a hexagonalbolt-head, as in g. 3, or a Thead, as in iig. 6.

The half recess o in each die may be triangular, as in figs. 1 and 2, orrectangular, as in fig. 5.

An outer recess, e, is `made in each die, the bottom of which is evenwith the top of the inner recess.

This recess e, or these recesses, are so made, that `when the dies cometogether, an open 'space shall be left on at least two sides of theinner, or bolt-head recess o.

Such open sides may be adjacent to each other, and must be for T-headAbolts, as in iig. 6, or they be opposite to each other, as in figs. 1,2, 3, and 5.

The remaining sides of the outer cavity e are made flush, or even withthe corresponding sides of the inner cavity c, as in all the figuresexcept fig. 4, which shows a pair of dies with the outer recess e open,or enlarged on all sides, around the inner recess, or cavity c.

The header b is made of the size and shape to t the outer, or largerrecess e, and receives, from its cam, C, a stroke such as to bring itsworking-face, in heading a bolt, even with the top of the inner cavityc.

The face of this header b may be concave or have other desirableform, soasto make the top face of the bolt-head dat, convex, or otherwise, atpleasure.

The rod from which the bolt is to be formed, being.

heated, is introduced, between the griping-dies dd', through theaperture A suciently far, so that enough metal shall project through toform a bolt-head of the required size. The griping-dies then catch therod by the semi-cylindrical cavities, when the header b comes forward,strikes the end of the rod, and upsets a head in thelower recess c. Thedies then open; the bolt, if

square, is turned one-fourth way around;9if hexagonal,

'one-sixth; if rectangular, or of Tlshape, one-half, Sto.;

and the dies, by another stroke, work into the head any flash, or firethat may have been formed on the head at the'previous stroke. The boltbeing cut off, the bar is then complete, and the operation is repeated.

It will be observed, that with the construction of dies shown anddescribed, any part of the bolt-head on which a flash, or fire, can beformed at the first stroke of the dies, will, on the turning of the boltas described, at the next succeeding stroke of the dies, come against asolid face of some one of the dies. Thiswill prove the case inreference' to all, except the T-head bolt, shown in iig. 5, and in thatthe only exception will be -as to the ash, or re, if any, which may beformed at the part of the rolls. But, in all the dies shpwn, the flash,or re,wi1l be formed solely, if not exclusively, on the edges of theupper face of the bolt-head, which arenext the enlarged, or open part ofthe upper recess e,

and' every flash, or fire there formed, will, on the turning of thebolt, come against the opposite faces-ofthe upper recess, which are Hushwith the corresponding faces of the lower recess c.

I have described the outer recess as being enlarged, or open on twosides of the inner recess, but in dies for making a hexagon bolt-head,as in g. 3, the outer recess should be open, or enlarged around half theperiphery of such recess.

I am aware that it is not new to turn a partly-formed bolt one-quarterway around to Work in the flash, or re; also, that bolt-heading dieshave been so made that a flash, or re, formed on an57 part of the head,would, at a subsequent stroke of the dies, on thel head being turnedone-quarter of' the way around, come in contact with a solid face of'one ofthe dies. I, hence, do not claim these features as applied broadlyto boltheading dies of substantially a different construction fromy thatabove described; but

What I do claim Aas my invention, and desire to se- 4cure by LettersPatent, is-

